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The Renesas RX port of as
has a few target specfic
command line options:
-m32bit-doubles
This option controls the ABI and indicates to use a 32-bit float ABI. It has no effect on the assembled instructions, but it does influence the behaviour of the ‘.double’ pseudo-op. This is the default.
-m64bit-doubles
This option controls the ABI and indicates to use a 64-bit float ABI. It has no effect on the assembled instructions, but it does influence the behaviour of the ‘.double’ pseudo-op.
-mbig-endian
This option controls the ABI and indicates to use a big-endian data ABI. It has no effect on the assembled instructions, but it does influence the behaviour of the ‘.short’, ‘.hword’, ‘.int’, ‘.word’, ‘.long’, ‘.quad’ and ‘.octa’ pseudo-ops.
-mlittle-endian
This option controls the ABI and indicates to use a little-endian data ABI. It has no effect on the assembled instructions, but it does influence the behaviour of the ‘.short’, ‘.hword’, ‘.int’, ‘.word’, ‘.long’, ‘.quad’ and ‘.octa’ pseudo-ops. This is the default.
-muse-conventional-section-names
This option controls the default names given to the code (.text), initialised data (.data) and uninitialised data sections (.bss).
-muse-renesas-section-names
This option controls the default names given to the code (.P), initialised data (.D_1) and uninitialised data sections (.B_1). This is the default.
-msmall-data-limit
This option tells the assembler that the small data limit feature of
the RX port of GCC is being used. This results in the assembler
generating an undefined reference to a symbol called __gp
for
use by the relocations that are needed to support the small data limit
feature. This option is not enabled by default as it would otherwise
pollute the symbol table.
-mpid
This option tells the assembler that the position independent data of the
RX port of GCC is being used. This results in the assembler
generating an undefined reference to a symbol called __pid_base
,
and also setting the RX_PID flag bit in the e_flags field of the ELF
header of the object file.
-mint-register=num
This option tells the assembler how many registers have been reserved
for use by interrupt handlers. This is needed in order to compute the
correct values for the %gpreg
and %pidreg
meta registers.
-mgcc-abi
This option tells the assembler that the old GCC ABI is being used by the assembled code. With this version of the ABI function arguments that are passed on the stack are aligned to a 32-bit boundary.
-mrx-abi
This option tells the assembler that the official RX ABI is being used by the assembled code. With this version of the ABI function arguments that are passed on the stack are aligned to their natural alignments. This option is the default.
-mcpu=name
This option tells the assembler the target CPU type. Currently the
rx200
, rx600
and rx610
are recognised as valid
cpu names. Attempting to assemble an instruction not supported by the
indicated cpu type will result in an error message being generated.
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